Air Bagan said the plane, which was carrying 63 passengers and six crew members, was forced to make an "emergency landing".
Witnesses said smoke filled the plane when it hit the ground and was still rising from the plane's badly charred wreckage hours later.
Airport officials in Heho said that injured passengers were taken to a hospital in the nearby city of Taunggyi for treatment.
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Temperatures will reach around 28 Celsius (82F) at their highest.